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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eacbf69d913b35443308c58733f9c3949b1d9c7b3831d832850e6154052cccbb' 
  AND token = 'he9Xreq5E7zA68wEmytJyZ9f1vXrtmbH7otGdSrLT9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}